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Step 7: Troubleshooting
Doc 6001536, Rev C
Problem 3B: Software shows status of all EMCs as red dots meaning there is no connection from
the EMC to the PC.
Verify that the RS-485 converter is connected to a functional COM port on the host PC; refer to
Figure 18 (page 20). Also, EMWin will select COM 1 as its default port; however, if using another
port, you must manually designate the COM port in EMWin (refer to the
EMWin User’s Guide
).
Verify the wiring of the RS-485 Converter; refer to Figure 19 on page 20.
Check the RS-485 converter’s plug-in 12VDC power supply.
Verify communication termination (W2 jumpered).
Is the Receive (Rx) LED (Green) flickering?
No- A RS-485 converter fault, COM 1 fault, cabling error, or the program is not running.
Note:
The EMWin software should be displaying the controller as a “green” or “yellow” dot at the bottom
of the screen.
Frequently Asked Questions Guide
SYMPTOM
CHECK
REFER TO PAGE
Check RS-485 wiring.
Check EMC DIP switch setting.
In multi-EMC system:
EMCs addressed as
EMC #1.
No communication between
PC and EMC.
No communication between
EMC and other EMCs.
Most common error is DIP Switch is
programmed up-side-down.
Com1 error:
Port being used.
Disable all auto-loading background
programs (e.g., Palm Pilot or Phone Link).
-
Check DIP switch setting for EMC address
number.
Check communication wiring; polarity is
critical. Com (+) to RS-485 (+)/B; COM (-) to
RS-485 (-)/A.
EMC
not
on-line.
Re-power EMC.
Close all applications before installing
EMWin. Check that no background program
is currently running (e.g., COM Links, Palm
Pilot, or Phone).
-
Uninstall through the Control Panel any
earlier version of EMWin.
-
Run Time Error
after initial
installation.
Reinstall EMWin.
-
The EMC draws less than .250 amps @
12VDC.
Power Consumption of EMC
All other hardware power consumption must
be sized appropriately.
-
Change jumper setting for voltage supplied to
readers on jumper W1.
-
Check reader wiring.
Reader Connect/Disconnect
Error
The four unused reader wires cannot short
together or ground to shield. Shorting will
cause erratic behavior.
-
